Disk grinder.



J. MILLER, JR.

DISK GRINDER. APPLICATION FILED APR. 8, 1911.

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3 SHEETS-$113151? 1.

Patented June 18, 1912.

COLUMBIA PLANunRAPN J. MILLER, JR. DISK GRINDER. 1 APPLICATION FILED 11388.8, 1911.

1,029Q882, Patented June 18, 1912.

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COLUMBl A FLANDGRAPH CO., WASHINflTbN, D. C.

J MILLER, 'JR.

DISK GRINDER.

. 7 APPLIOATION FILED APR. 8, 1911. 1,029,882, v Patented June 18, 1912.

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JOHN MILLER, JR, 0F BELOIT, WISCONSIN, ASSIGNOR TQCI-IARLES H. BESLY 8:: COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

DISK GRINDER.

To all whom it may concern:

Be it known that 1, JOHN MILLER, Jr., a citizen of the United States, and a resident of Beloit, in the county of Rock and State of Wisconsin, have invented certain new and useful Improvements in Disk Grinders; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to improvements in adjustable tables for use with disk grinders which embrace a column, a rotative disk provided with an abrading sheet or other working face, and a table located in front of the disk with. its rear edge parallel to and closely adjacent to the plane of said disk, said table being adapted for the support of the work-piece in engagement with the working face of the grinding disk.

The invention consists of the matters hereinafter described and more particularly pointed out in the appended claims.

In the drawingsFigure 1 is a view representing a front elevation of a disk grinder providedwith my adjustable table; Fig. 2 is a view representing a transverse section of the machine in a plane indicated by the line 2-2 of Fig. 3; Fig. 3 is a view representing a side elevation of the disk grinder. Fig. 4 is a view representing a top plan view of the carriage adapted for the support of the table; Fig. 5 is a view representing said carriage in side elevation; Fig. 6 is a view representing a side elevation of a segmental plate which directly supports the table; Fig. 7 is an end view of said segmental plate; Fig. 8 is a view representing a partial vertical section of the machine in a plane indicated by the line 8-8 of Fig. 3; Fig. 9 is a view representing a cross section through the vertical shaft that supports the carriage in a plane indicated by the line 9-9 of Fig. 8.

Referring now in detail to that embodiment of my invention illustrated in the drawings: A indicates the column or frame of the machine and B, the grinding disk, which is rotatively supported thereon by a horizontal shaft C. The disk is rigidly secured to the front end of the shaft C which Specification of Letters Patent.

Application filed. April 8, 1911.

Patented June 18, 1912.

Serial No. 619,749.

is mounted in bearings 0 0, carried at the top of the column and which is driven by a pulley C.

D indicates the work-table. Said table is rigidly secured at one end (the right end as shown in Fig. 1) to an arm, in this case a vertical segmental plate E. The table D has a depending web or rib (Z near its front edge and the segmental plate is secured to the end of the table and to the end of said web or rib by lag-screws E which extend through suitable apertures in the plate E and are threaded into said table and web.

F indicates a support for the table, which, as shown in the drawings, constitutes a car riage adapted for vertical adjustment to vary the level of the table and for horizontal rotative movement to swing the table away from the face of the grinding disk when it is necessary to get at the grinding disk for the purpose of replacing the abrading sheet or for any other reason. Said carriage comprises a block or hearing f mounted on a vertical shaft E located at one side of the column or frame of the machine at the rear of the grinding disk, and a vertical, hollow, segmental casting F, upon which the segmental plate E is rotatively supported as will be presently more particularly de scribed. The shaft E is supported at its lower end by a strap 6 .and a bracket 6 secured to the side of the column near its base, and at its upper end is rigidly connected by a strap 6 to a bracket 9 which projects laterally from a standard G bolted to the top of the column and rising upwardly therefrom. The block f is adapted for vertical sliding movement on theshaft E and for horizontal rotative movement upon said shaft as an axis. Said block is split vertically (see Figs. 2, 4 and 5) and is provided with upper and lower pairs of ears a 6 through each pair of which extends a clamping bolt 6 Nuts 6 provided with crank arms 6" serve to clamp the block f in POSI' tion on the shaft E after it has been adjusted vertically and horizontally.

The segmental plate E is supported upon the casting F so as to have rotative movement in a vertical plane in the following manner. The casting F is provided with an arcuate flange or tongue I extending at right angles to the face of said casting.

. the segmental plate E Said flange or tongue is located forward of the block f and is formed in the arc of a cir cle, having its center in a horizontal line in the plane of the working face of the grinding disk when the carriage is in its normal angular position on the shaft E. The segmental plate E is provided on its in ner face with an arcuate groove J formed by an arcuate member comprising radially spaced arcuate flanges or ribs J J projecting at right angles to the face of said segmental plate and connected at their outer edges by a web j parallel to the face of said plate. Said flanges and groove are formed in the arc of a circle having its center in a line parallel to the edge (Z of the table D,

which lies adjacent to the face of the grinding disk and spaced rearwardly therefrom a distance equal to the short distance separating said rear edge of the table from the face of the grinding disk when the table is located in operative relation therewith. The arcuate tongue or flange I of the casting F is adapted for engagement within the groove J between the flanges J and J of the segmental plate E the flange J 2 being rotatively supported by the arcuate tongue I. A semi-cylindric apertured block K bears within the said tongue I. j indicates a slot formed in. the flange J 2 and extending parallel to the plane of the segmental plate. K indicates a bolt extending through the block K and the slot j of the flange J and threaded into the arcuate tongue I. This construction provides means for locking the segmental plate to the carriage and for preventing longitudinal movement between the tongue I of the carriage and the flanges J, J 2 of the segment-a1 plate. The segmental plate is thus supported in guiding relation with the carriage so that it may be freely rotated in a vertical plane.

Independent means for clamping the segmental plate in any desired angularrelation with the carriage is provided as follows: L, L indicate arcuate slots in the segmental plate E the arcs of said slots being concentric with the arcs of the flanges J and J Z, Z indicate faced bosses provided adjacent to said slots. M indicates an arcuate plate which engages against the face of the boss Z m indicates a bolt threaded into the front wall of the casting F of the carriage and projecting outwardly therefrom through the slots L and through an aperture m in the plate M. A nut m serves to hold said plate M in guiding relation with N indicates a second bolt threaded into the casting F and extending outwardly therefrom through the slot L in the segmental plate E. A nut N is provided with a .crank arm N and engaging against the boss Z serves to provide clamping means for drawing the segmental plate E rigidly against the casting F of the carriage and holding said plate against rotative movement in relation to the carriage.

The inner edge (Z of the plate D is beveled, as clearly shown in Fig. 3, in order to permit said table to be swung about the line of intersection of its plane with that of the working face of the grinding disk as an axis when the rear edge of the table is located closely adjacent to the face of the grinding disk. It is apparent from the above description that after loosening the nut N, the segmental plate E may be rotated upon its bearing with the carriage casting F to adjust it to different angles with the working face of the grinding disk. In order to adjust the table to the required angle with the plane of the grinding disk, a protractor Q is formed on the outer face of the casting F and a needle or indicator Q is secured to the rear edge of the segmental plate E Said protractor is so graduated that when the table I) is at right angles to the vertical plane of the face of the grinding disk, that is to say, when said table is horizontal, the indicator or needle coincides with the position of the zero mark on the protractor. Thus by moving the segmental plate to bring the indicator Q to correspond with the desired angle on one side or the other of the zero mark on the protractor, the table D will be brought to the required inclined position above or below a horizontal plane.

The table is counterbalanced by a weight R (see Figs. 1 and 3), which is connected to an eye 1" secured to the top of the carriage F by means of a rope or band R. Said rope or hand passes over pulleys R R rotatively supported at the top of the standard G. The carriage may be adjusted vertically by loosening the nuts 6 whereupon the block f may be moved vertically up or down upon the shaft E, the counterweight R balancing the weight of the carriage and its connected parts, so that the movement may be made with little effort on the part of the workman. After it is raised or lowered to bring the table to the desired position, the bolts 6 are drawn up to clamp the sliding block f in its new position on the shaft.

The carriage F is provided with a stop lug F (see Fig. 2) which is adapted to engage a vertically extending fixed bar S. Said bar is so located as to limit the horizontal rotative movement of the table D when its inner edge (Z is brought into parallelism with the working face of the grinding disk B. The column A is provided with a vertical face A at right angles to the plane of the grinding disk and the standard G has a face G in the same vertical plane as the face A. The bar S is secured at its lower end to the face A of the column and at its upper end to the face G of the standard G by means of bolts 8, (see Figs. 2

and 3) which extend through horizontally elongated apertures s in said bar. Vertically spaced lugs T made rigid with the column are located adjacent the rear edge of said bar and through said lugs are threaded set-screws 2, which engage the rear edge of said bar S. Said set-screws are provided with lock nuts t. By loosening the bolts 5 the vertical position of the bar S may be accurately adjusted by means of the setscrews to exact parallelism with the vertical face of the grinding disk.

From the above description it is apparent that in my improved machine the work table is not only capable of angular adjustment with reference to the plane of the grinding disk and also of vertical adjustment, but that in any position of angular or vertical adjustment it may be swung away from the working face of the grinding disk to give free access thereto,

lVhile in describing one embodiment of my invention, I have referred to certain details of mechanical construction, it is understood that I do not limit my invention thereby, except as pointed out in the appended claims.

I claim as my invention- 1. In a machine of the class described, in combination with a grinding disk, a worktable, an arm rigidly secured to one end of said work-table and a support for holding said table in operative relation with said grinding disk, means for rotatively mounting said arm on said support comprising an arcuate tongue made rigid with one of the two members, the said arm and the said support, and extending at right angles to the plane of movement of said arm, an arcuate member made rigid with the other of said two members and embracing radially spaced flanges extending parallel with said tongue and a web connecting the outer ends of said flanges, said arcuate tongue engaging between the flanges of said arcuate member to support the said arm on the said support, means adapted for locking said tongue to said arcuate member to prevent longitudinal movement of one with reference to the other while permitting free rotative movement between the two and means for clamping said arm in fixed relation with said support.

2. In a machine of the class described, in combinationwith a grinding disk, a worktable, an arm rigidly secured to one end of said work-table and a support for holding said table in operative relation with said grinding disk, means for rotatively mounting said arm on said support comprising a horizontally extending arcuate tongue made rigid with said support, an arcuate member made rigid with said arm and embracing radially spaced flanges extending at right angles to the plane of movement of said arm, and a web connecting the outer ends of said flanges, said arcuate tongue engaging between the flanges of said arm to support the same, one of said arcuate members being provided with a slot extending parallel to the plane of movement of said arm, a bolt extending through said slot and rigidly secured to the other arcuate member, and means for clamping said arm in fixed relation with said support.

3. in a machine of the class described, in combination with a grinding disk, a work table, an arm rigidly secured to one end of said work-table and a support for holding said table in operative relation with said grinding disk, means for rotatively mounting said arm on said support, comprising a horizontally extending arcuate tongue made rigid with said support, an arcuate member made rigid with said arm, and comprising radially spaced, horizontally extending flanges, and a web connecting the outer ends of said flanges, the flange of smaller radius being provided with a slot extending parallel to the plane of movement of said arm, a semi-cylindric block bearing within said arcuate tongue, .a bolt extending through said slot and rigidly connecting said arcuate tongue with said block, and means for clamping said arm in fixed relation with said support.

4. In a machine of the class described, the combination of a grinding disk having a flat vertically arranged grinding face, a worktable, an arm rigidly attached to one end of said worlctable, a carriage for supporting said arm, a fixed upright cylindric shaft, means providing endwise sliding and rotative bearing for said carriage on said shaft, means for clamping said carriage to said shaft, means providing a rotative bearing between said arm and said carriage, adapted for swinging said table about the line of intersection of its plane with the flat face of the grinding disk as an axis, and means for holding said table in various adjusted positions relatively to the carriage.

5. In a machine of the class described, the combination of a grinding disk having a flat vertically arranged grinding face, a worlctable, an arm rigidly attached to one end of said work-table, a carriage for sup porting said arm, a fixed upright cylindric shaft, means providing endwise sliding and rotative bearing for said carriage on said shaft, means for clamping said carriage to said shaft, a counterbalance weight connected and moving with said carriage, means providing a rotative bearing between said arm and said carriage, adapted for swinging said table about the line of intersection of its plane with the flat face of the grind- ,ing disk as an axis, and means for holding said table in various adjusted positions, relatively to the carriage.

6. In a machine of the class described, the

combination of a grinding disk having a fiat vertically arranged grinding face, a worktable, an arm rigidly attached to one end of said work-table, a carriage for supporting said arm, a fixed upright cylindric shaft, means providing endwise sliding and rotative bearing for said carriage on said shaft,

means for clamping said carriage to said shaft, means adapted to limit the swinging movement of the carriage in a direction to carry the work-table toward the grinding disk, means providing a rotative bearing between said arm and said carriage, adapted for swinging said table about the line of intersection of its plane with the flat face of the grinding disk as an axis, and means for holding said table in various adjusted positions relatively to the carriage.

7. In a machine of the class described, the combination of a grinding disk having a flat, vertically ar 'anged grinding face, a worktable, an arm rigidly attached to one end of said work-table, a carriage for supporting said arm, means for supporting said carriage, embracing an upright shaft adapted to afford rotative movement of the carriage in a horizontal plane and also vertical movement of the same, clamping means associated with said shaft for holding said carriage rigidly from both vertical and rotative movement when the work-table is placed in a desired position, means providing rotative bearing between said arm and said carriage adapted for swinging said work-table about the line of intersection of its plane with the flat face of the grinding disk as an axis, and means for clamping said arm to said carriage.

8. In a machine of the class described, the combination of a grinding disk having a fiat, vertically arranged grinding face, a work-table, an arm rigidly attached to one end of said work-table, a carriage for supporting said arm, means for supporting said carriage affording rotative movement thereof in a horizontal plane and also vertical movement of the same, a counterbalance weight connected and moving with said carriage, means for holding said carriage rigidly from movement when the work-table is placed in a desired position, means providing rotative bearing between said arm and said carriage adapted to swinging said work-table about the line of intersection of its plane with the flat face of the grinding disk as an axis, and means for holding said work-table in various adjusted positions relatively to the carriage.

9. In a machine of-the class described, in combination with the grinding disk and the work-table, an arm rigidly secured to one end of said work-table, a carriage for supporting said arm, means providing rotative bearing between said arm and said carriage adapted for swinging said table about the .line of intersection of its plane with that of the disk as an axis, means for clamping said arm to said carriage, and means for rotatively supporting said carriage to swing in a plane at right angles to the plane of said grinding disk. I

10. In a machine of the class described, in combination with the column, the grinding disk rotatively carried thereby, and the work-table, a carriage for supporting said work-table in operative relation with said grinding disk, a shaft parallel to the working face of said grinding disk, means'providing a rotative and longitudinally movable bearing for said carriage on said shaft, and a stop member secured to said column and adapted to limit the rotative movement of said carriage toward said grinding disk, said stop member consisting of a bar extending parallel to said shaft, and means for adjusting said bar in parallelism with the plane of said disk.

In testimony, that I claim the foregoing as my invention I afiix my signature in the presence of two witnesses, this 30th day of March A. D. 1911.

JOHN MILLER, JR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

